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+'nb_words_title' Number of words in the article's titles
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+'nb_words_content' Number of words in the article
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+'pp_uniq_words' Proportion of unique words in the article
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+'pp_stop_words' Proportion of stop words (i.e. words predefined to be too common to be of use for interpretation or queries, such as 'the', 'a', 'and', etc.)
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+'pp_uniq_non-stop_words' Proportion of non-stop words among unique words
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+'nb_links' Number of hyperlinks in the article
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+'nb_outside_links' Number of hyperlinks pointing to another website
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+'nb_images' Number of images in the article
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+'nb_videos' Number of videos in the article
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+'ave_word_length' Average word length
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+'nb_keywords' Number of keywords in the metadata
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+'category' Category of the article: 0-Lifestyle, 1-Entertainment, 2-Business, 3-Web, 4-Tech, 5-World
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+'nb_mina_mink' Minimum number of share counts among all articles with at least one keyword in common with the article
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+'nb_mina_maxk' Minimum number of maximum share counts per keyword
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+'nb_mina_avek' Minimum number of average share counts per keyword
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+'nb_maxa_mink' Maximum number of minimum share counts per keyword
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+'nb_maxa_maxk' Maximum number of share counts among all articles with at least one keyword in common with the article
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+'nb_maxa_avek' Maximum number of average share counts per keyword
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+'nb_avea_mink' Average number of minimum share counts per keyword
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+'nb_avea_maxk' Average number of maximum share counts per keyword
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+'nb_avea_avek' Average number of average share counts per keyword
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+'nb_min_linked' Minimum number of shares of articles from the same website linked within the article
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+'nb_max_linked' Maximum number of shares of articles from the same website linked within the article
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+'nb_ave_linked' Average number of shares of articles from the same website linked within the article
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+'weekday' Day of the week: 0-Monday, 1-Tuesday, 2-Wednesday, until 6-Sunday
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+'dist_topic_0' Distance to topic 0
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+'dist_topic_1' Distance to topic 1
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+'dist_topic_2' Distance to topic 2
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+'dist_topic_3' Distance to topic 3
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+'dist_topic_4' Distance to topic 4
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+'subj' Subjectivity
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+'polar' Sentiment polarity
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+'pp_pos_words' Proportion of positive words in the article
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+'pp_neg_words' Proportion of negative words in the article
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+'pp_pos_words_in_nonneutral' Proportion of positive words among the non-neutral words of the article
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+'ave_polar_pos' Average sentiment polarity of the positive words
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+'min_polar_pos' Minimum sentiment polarity of the positive words
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+'max_polar_pos' Maximum sentiment polarity of the positive words
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+'ave_polar_neg' Average sentiment polarity of the negative words
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+'min_polar_neg' Mimimum sentiment polarity of the negative words
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+'max_polar_neg' Maximum sentiment polarity of the negative words
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+'subj_title' Subjectivity of the title
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+'polar_title' Polarity of the title
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